Microstructure failure in ferrite-martensite dual phase steel under in-situ tensile test  

作　　者：Rui-bin Gou Wen-jiao Dan Wei-gang Zhang Min Yu Chun-yu Zhang Yin-hu Qiao Lu Ma 

机构地区：[1]Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, China [2]School of Mechanical Engineering, Anhui Science and Technology University, Bengbu 233100, Anhui, China [3]Innovation Center for Advanced Ship and Deep Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China [4]College of Architecture, Anhui Science and Technology University, Bengbu 233100, Anhui, China

出　　处：《Journal of Iron and Steel Research International》2017年第3期350-356,共7页

基　　金：supported by the National Natural Science Foundation of China(51375307 );the Anhui University Provincial Natural Science Research Project(KJ2016A181 );the Key Discipline Team(AKZDXK2015C03);High Level Talent Research Project of Anhui Science and Technology University(ZRC2014464)

摘　　要：To investigate microstructure failure in ferrite-martensite dual phase steel,in-situ observations were performed on multiple plate DP800 specimens during uniaxial tensile tests. Microstructure evolution of the observed region was investigated in details. The experimental data showed that micro-cracks in various regions differed in the initiation time,and micro-failures mainly occurred from the locations with typical characteristics of stress concentration（ i. e. ferrite interiors,the interfaces of ferrite-martensite grains and the martensite-martensite interfaces）. Growth of micro-crack generally experienced the following stages： cracking from martensite boundaries,tiny particles in ferrite interiors,or martensite interiors,propagating in ferrite,bypassing martensite boundaries,or passing through martensite-martensite interfaces,finally ending on martensite boundaries. Martensite was one important source of micro-failure and changed the propagation of micro-cracks significantly. Microstructure deformation was inhomogeneous in the stage of plastic deformation.To investigate microstructure failure in ferrite-martensite dual phase steel,in-situ observations were performed on multiple plate DP800 specimens during uniaxial tensile tests. Microstructure evolution of the observed region was investigated in details. The experimental data showed that micro-cracks in various regions differed in the initiation time,and micro-failures mainly occurred from the locations with typical characteristics of stress concentration（ i. e. ferrite interiors,the interfaces of ferrite-martensite grains and the martensite-martensite interfaces）. Growth of micro-crack generally experienced the following stages： cracking from martensite boundaries,tiny particles in ferrite interiors,or martensite interiors,propagating in ferrite,bypassing martensite boundaries,or passing through martensite-martensite interfaces,finally ending on martensite boundaries. Martensite was one important source of micro-failure and changed the propagation of micro-cracks significantly. Microstructure deformation was inhomogeneous in the stage of plastic deformation.

关 键 词：MICRO-FRACTURE Dual phase steel FERRITE MARTENSITE In-situ observation 

分 类 号：TG142.1[一般工业技术—材料科学与工程]